The startechcom pc case exhaust fan is an add in cooling fan designed to fit in the pci or isa expansion slots of any computer it is used to exhaust warm air out preventing problems due to overheating components the exhaust fan inlet faces adjacent pci or agp cards and makes a great video card cooler for hot running 3d accelerator cards like the voodoo tnt2 geforce256 and others a quiet running brushless dc motor coupled with a high efficiency blade design is capable of moving 36 cfm cub